THE INVENTOR'S AND MECHANIC'S GUIDE.--A valuable book upon Mechanics, Patents, and New Inventions. Containing the U. S. Patent Laws, Rules and Directions for doing business at the Patent Office; 112 diagrams of the best mechanical movements, with descriptions; the Condensing Steam Engine, with engraving and description; How to Invent; How to Obtain Patents; Hints upon the Value of Patents; How to sell Patents; Forms for Assignments; Information upon the Rights of Inventors, Assignees and Joint Owners; Instructions as to Interferences, Reissues, Extensions Caveats, together with a great variety of useful information in regard to patents, new inventions, and scientific subjects, with scientific tables, and many illustrations 108 pages. This is a most valuable work. Price only 25 cents. Address MUNN & CO., 37 Park Row, N.Y. * * * * * BALL, BLACK & CO. Nos. 565 and 567 BROADWAY, Offer an Unequaled Assortment of JURGENSEN, NARDINE, JACOT, SALTZMAH, NICOUD, GERARD, FRODSHAM, PEARDON, GORDING, RUGENSTEIN, HARRISON, TAYLOR. ALSO, A FULL LINE OF AMERICAN WATCHES, At the Lowest Price. * * * * * ROPER Carloric Engine Co., 49 Cortlandt st. New Style Upright Engines. Send for Circular. * * * * * Perpetual Brick Kiln. SAVES 2-3 IN FUEL. Address WEDEKIND & DUEBERG, 55 N. Calvert st., Baltimore, Md. * * * * * WANTED-To correspond with an extensive manufacturing firm of 1st-class reliability, to make and sell, on royalty, Dodge's 2-way cock or pump attachment. Exclusive control of territory given. 100,000 doz wanted in U.S. Address Hedden & Dodge, Lowville, N.Y. * * * * * WANTED.-- In an Extensive Agricultural Implement Works in Ohio, an Experienced and Capable Superintendent. None but a Through Machinist, who can give high reference as to Character, etc., need apply. Address Thrashing Machine Works, Drawer 5947, Chicago, Ill. * * * * * RIGGS' BELMONTYLE OIL PREVENTS Rust, Tarnish, etc. Send for circular to H.B. Riggs, 150 Front Street, Hew York. * * * * * The Mother's Journal. THE BEST HOME MAGAZINE IN THE WORLD. Beautifully illustrated; 600 double-column pages; $2 per year. Specimens sent free. Now is the time. Address MOTHERS' JOURNAL, Chicago, 111. * * * * * DECISION ON STEAM ENGINES.--Wm. A. HARRIS, builder of the Corliss Steam Engine, was awarded the 1st Premium at the National Fair of the American Institute, New York,1869, for its superiority in economy in fuel, regularity in speed, perfect construction, accessibility of all its parts. Send for a circular. One 80-H.P. Engine, ready for delivery; one 40-H.P. Engine, ready for delivery; three 30-H.P. Engines, ready for delivery. WM. A. HARRIS Providence R.I. New York Office 49 Murray st. Send for a circular.